I haven't got any good pictures that you might not already have seen (ATPL JAR OXFORD). But here's what I know...
The main gyroscopic effect of an engine failure are due to the following:
- the amount of drag the featherd propeller produces
- loss of prop wash on the wing from the dead engine
- Differential airspeed over the wings due to live engine prop wash compared to the dead engines lack of propwash (full power on the live engine)
- turning moment from the live propeller (downgoing blade produces more thrust than up-going blade).
With a multi-engined aircraft p-factor isn't much of a factor to count in, since the thing that causes p-factor is the turning stream around the aircraft, produced by the propeller which hits the fin. And since the fin is located at an off-set position to the propeller stream it's not touching the fin, at least not by much...
This guy explains it pretty good:
http://www.qmfc.org/school/asym.htm